Ballpoint pen



FIG. 1 is a perspective view of the top, front and left side of a ballpoint pen showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a ballpoint pen, as shown and described. 